VI 
CONTENTS. 
Functions of relation — Continued. Page. 
Vibracula 64 
Mucro 66 
Spines 66 
Radicular fibers 66 
Zooecia ; 66 
Form and size.... 66 
Total regeneration 67 
Calcified zooecia 68 
Vestibular arch 68 
Zoarium 68 
Terminology 68 
Habitat 69 
Principles of classification of the Cheilostomata 70 
Systematic classification of early Tertiary Cheilostomata 72 
Systematic descriptions 73 
Order Cheilostomata Busk 73 
Suborder Anasca Levinsen 73 
Division I . Malacostega Levinsen 73 
Family Electrinidae D’Orbigny, 1851 73 
Genus Electra Lamouroux, 1816 76 
Membranipora Blainville, 1834 77 
Heterooecium Hincks, 1892 78 
Pyripora D’Orbigny, 1852 78 
Herpetopora Lang, 1914 81 
Group Membraniporae Canu and Bassler, 1917 82 
Section I . Membraniporae without ovieell 86 
Genus Conopeum Norman, 1903 86 
Heliodoma Calvet, 1907 94 
Membraniporina Levinsen, 1909 94 
Acanthodesia, new genus 99 
Adenifera Canu and Bassler, 1917 . 102 
Cupuladria, new genus 103 
Trochopora D’Orbigny, 1851 , 103 
Otionella Canu and Bassler, 1917 105 
Section II. Membraniporae with endozooecial ovieell 109 
Genus Vibraoellina Canu and Bassler, 1917 110 
Setosellina Calvet, 1906 Ill 
Hincksina Norman, 1903 Ill 
Ogivalina Canu and Bassler, 1917 117 
Membrendoecium Canu and Bassler, 1917 119 
Section III. Ovieell hyperstomial, always closed by the operculum 123 
Genus Periporosella Canu and Bassler, 1917 124 
Ellisina Norman, 1903 125 
Grammella Canu, 1917 130 
Membraniporidra Canu and Bassler, 1917 133 
Tremopora Ortmann, 1890 139 
Larnacius Norman, 1903 140 
Section IV. Ovieell never closed by the operculum 140 
Genus Alderina Norman, 1903 140 
Callopora Gray, 1848 1 145 
Amphiblestrum Gray, 1848 156 
Ramphonotus Norman, 1894 163 
Tegella Levinsen, 1909 165 
Stamenocella Canu and Bassler, 1917 , 168 
